Resurfacing and finishing machine



May 15-, 1962 E. T. PAWLSON RESURFACING AND FINISHING MACHINE 2Sheets-Sheet 1 Filed Nov. 5, 1959 INVENTOR.

E. T. PAWLSON RESURFACING AND FINISHING MACHINE May 15, 1962 Filed Nov.5, 1959 2 Sheets-Sheet 2 Iillllllll Illllllll v INVENTOR EUGENE T.PAwL'SoN BY fine,

' fine 3,034,262 RESURFACING AND FINISHING MACHINE Eugene T. Pawlson,RD. 1, Averill Park, N.Y. Filed Nov. 5, 1959, er. No. 851,180 8 Claims.(Cl. 51-9) This invention relates to an improved type of surfacefinishing or re-finishing device, having particular reference to such adevice that is a self-contained unit for treating plane, curved, or evenirregular surfaces, whether held substantially horizontally orvertically, by impinging there against and rebounding therefrom abrasiveor other particles traveling at high velocity and continuouslyrecovering the particles and recycling the same, and the provision ofsuch a device is the principal object of the invention.

1 am well aware that there are many sand-blasting or sand-throwingdevices but these are distinguishable in structure and function from thepresent invention which utilizes a combination and arrangement of partsthat has greater universality in accomplishing new and improved resultsthat are unobvious of attainment from previous devices.

Generally, it is an object of the invention to provide such' a devicethat is economic of manufacture, simple, yet sturdy and durable ofconstruction, which will operate with relative freedom from wear andtear or other mechanical difiiculties, and that is well suited to thepurposes for which it is intended.

More specifically, it is an object of the invention to provide such adevice in the form of a self-contained unit, which comprises a housinghaving a first chamber with an outlet for expelling abrasive or otherparticles therefrom, a second chamber connected to the first chamherwhich has an inlet thatis angularly disposed adjacent to such outlet forrecovering the particles therein, an outlet-inlet opening in the housingin common communication with the outlet and inlet of both said chambers2 the sweeps preferably being radially grooved or rearwardly steppedalong their throwing surfaces.

Another object of the invention is the provision of such rotary meanswherein the upper side of the disk and, the forward side of the sweepsare faced with a plastic material, preferably in the form of a removableplastic disk having upstanding plastic sweeps conforming inconfiguration to the first sweeps, with openings in the plastic disk toreceive the same in order that such plasticdisk can be fittedintoface-to-face relation with the underlying disk and sweeps as protectionagainst the abrasive particles.

and will in part appear hereinafter.

The invention accordingly comprises] the features of construction,combination of elements, and arrangement of parts that will beexemplified in the construction hereinafter set forth and the scope ofthe application of which will be indicated in the claims. 7 I

For a fuller understanding of the nature and objects of the invention,reference should be had to the following detailed description, taken inconnection with the accompanying drawings, in which:

FIG. 1 is a top view of an embodiment of the device tilted intooperative position;

FIG. 2 is an elevational view, with parts broken away and partly insection, of FIG. 1;

FIG. 3 is a sectional view taken along the line 3-3 of FIG. 2 andlooking in the direction of the arrows:

FIG. 4 is a perspective view, with parts broken away and partly insection, illustrating a partially plastic faced rotary means;

FIG. 5 is a perspective view of a fragmentary portion of such a rotarymember without the plastic facing; and

FIG. 6 is an elevational view of a fragmentary portion of the housingillustrating a form ofair valve to regulate the volume of air beingrecycled with such parthrough which such particles are ejected from thefirst chamber to be impinged against such surface and rebounded bydeflection into the second chamber, a return passage for the particlesfrom the second to the first chamber, and rotary means within the firstchamber to eject the particles therefrom, and simultaneously to recyclerebounded particles thereto from the second chamber by means of suchpassage.

Another object of the invention is'to provide the second chamber with aplurality of bafiies extending transversely of its walls to collect andmaintain the rebounded particles in the bottom of the chamber,

A further object is to provide a transverse partition between the sidewalls of the second chamber but spaced from the bottom thereof to forman inner and outer passage for directing rebounding particles to thechamber bottom when the outlet-inlet opening is held at a substantiallyangular position from the horizontal.

Yet another object is to provide such a partition with a hinged bafiieon its inner side, intermediate its ends, to close off the inner passa ewhen the outlet-inlet opening is tilted to a substantially horizontalposition.

Another specific object is to provide a return passage for suchparticles in the form of a conduit extending from adjacent the bottom ofthe second chamber which terminates at its opposite end within the firstchamber with its axis substantially normal to and offset from'the centerof the rotary means.

A further specific object is the provision of a rotary means comprisinga disk and a plurality of radially disposed particle throwing sweepsmounted on its upper surface.

It is also an object to provide sweeps that are curved at their outerends in the direction of the ejecting outlet,

ticles. I t

Referring now more particularly to the drawings, there is indicatedgenerally at ldsuchua device which constitutes a self-contained unit.

' Such a unit includes a housing indicated generally at:

1.1, having a first chamber 12 with an outlet indicated generally at 13for expelling abrasive or other particles tangentially therefrom, asindicated by the arrows in FIG. -2, in a sweeping pattern across asurface 17 as shown generally at 14 in FIG. 1. a g

The housing 11 is provided with a second chamber indicated generally at15 that is connected to the first chainber 12 as part of the housing11.. This second chamber has an inlet opening indicated generally at 16that is angularly disposed adjacent the outlet 13 for recovering theparticles passing there-through, after they have been rebounded from thesurface 1'1 and deflected downwardly, into the chamber 16,also'asindicated by the arrows in,

FIG. 2 v p r An outlet-inlet opening, indicated generally at 18, in thehousing 11 is in common communication with the outlot 13 of the chamber12, and .the inlet 16' of the chain must pass through the outlet-inletopening 18 to be" ejected from the first chamber outlet 13 and beimpinged against the surface 17, whether or not the latter be plane,curved or irregular, and the particles will be rebounded properly anddeflected into the second chamber.

Inorder that the outlet-inlet opening 18 may enhance Patented' ll/lay15, 1962 the efficacy of the operation, it should be provided with asoft, resilient shroud'or grommet 19*, made of rubber orothersuitablematerial, which readily can be replaced and in part will be in aswirling condition, there is provided a passage-way in the form of aconduit 22 which preferably is rigid and made integral with the chamberalong one corner thereof to terminate in an opening adjacenfthe bottom.The remaining portion of the conduit may consist ofa resilient pipe, orrubber hose connection23, that extends from the portion 22 upwardly andout of the top of the housing and downwardly to penetrate the chamber12, as indicated generally at 24. "It will' be observed that this endtofthe hose has its axis substantially perpendicular to a rotary meansindicated generally at 25 in the chamber 12. Of particular importance isthe fact thatlthe'end of the hose 24 is oil-set from the center of therotary means to provide a maximum sweep and throwingefii'ect for/theparticles as will more fully appear hereinafter.

The rotary means '25 comprises a disk '26 mounted to rotate with a shaft27 that mayconstitute, the shaft of any suitable low horsepower motor 28indicated in dotted line position, On the upper surface of the disk 26there is providedia plurality of radially disposed particle throwingsweeps 29 which preferably are curved at their outer ends in thedirection of the ejecting outlet 13 as shown in drawingv Preferably,also, these sweeps on their forward 7 faces are radially grooved, orstepped, as indicated generally at 30; The offset position of the end ofthe conduit 24, above mentioned, it will be observed, is such that itfalls in approximiately the; 3rd quadrant overlying the sweeps, i;e., insuch a position as to feed the particles to the sweeps in a mannersuchthat the particles will 'beswept outwardly tdwards the ends thereof,after the particles have passed through an arcl within a range ofapproximately 180 to 270 tangentially to be ejected or sprayed in asweptpattern from the outlet 13, and, con-- sequently, thro ugh theoutlet-inlet 18 across the surface 17, as above indicated.

The above described device, being readily portable and self-contained,may be provided with dual handles o epositely disposed on thehousing,such as those indicated at 31,, one of which may-be provided with a pushb utton switch 32 to start and stop the motor 23.

Itwill be understood that the high velocity of the abrasive particles,whensuch are used, might readily tend to. wear downthe sweeps,especially at their ends, and to avoid this such sweepsshould be made ofany suitable hardmetal that would unaffectedby such action offacerelation on its bottom side with the upper surface of the disk 26.

Such plastic disks are readily replaceable by merely removing screws 35that pass through a cover plate35 to enter the threaded openings 37 inthe metal sweeps 29,

Since the rotary means'ZS creates a vacuum by sucking air as well asparticles through the conduit 22, to dis tribute such particles offcenter of the rotary means, it is. desirable to be able to control thevolume of such air being circulated. This is readily done by anadjustable cover plate or plates 38 covering the screened opening 39 atone or both sides of the housing 11 as shown in FIG. 6.

.As above indicated the device is intended to be tilted when inoperation as. shown in FiG. 2. That is to say, it is tilted with respectto the outlet-inlet opening 18 so that the particles are angularlydeflected into the return chamber 15.

As shown in FIG. 2, the device is held against a vertical surface but itcan be held against any surface that is angularly disposed to thehorizontal, However, when the face of the outlet-inlet opening 1 8 isheld against a surface that is substantially horizontal, there issome-danger that the accumulated particles in the chamber 15 may fallout of the outlet-inlet opening 18. To prevent this,

7 the chamber 15 has been suitably provided with baflles.

Let it be note-:Lthat, regardless of the position of the device, whetherbeing used vertically or angularly with respect to the horizontal',there is provided a plurality of downwardly sloped baffles 40,; 41 and42 that extend transversely of the side walls of the chamber 12. Two ofthese baffles, namely, 46 and Marc connected to atrans- 1 versepartition or wall 43 that extends from a line approximately midway ofthe outlet-inlet opening 18, as at 44, to terminate short of the bottomof the chamber as atAS Thereby forming. a double passage indicated gemerally at43 and 43." that are in communication at the bottom oftltechamber 15 adjacent the opening of the conduit portion 42. i

It will also be observed that thebaflle portion 42 is hinged torthetransverse partition, as at 46', so that the latter can beturned tothejdotted line position by means,

of a handle 47 (see FIG. I) to close oifthe chamber 43,"

inlet; and those already'collected in the chamber 15' will be preventedfrom falling from that chamber section 43' bythe rebounding particlesbeing deflected therein and I the increased suction pulling-them throughthe recycling conduit; i

Such a device has many advantages and improvements and provides a.substantial number of new results. The

particles are constantly re-used by being rebounded from the particles;However, in certain cases where such-hard metal might; prove, to be tooexpensive, I- propose to face orcoat the leading surfaces of the sweepswith .a

suitable plastic material. Preferably, I do this by providing: a readilyremovable or replaceable plastic disk 33, i.e. of the same diameter asthe metal disk 26. Radially disposed on the plastic disk, preferablyintegral there.- with and upstanding therefrom are a plurality ofplastic sweeps 34. that conform in configuration to the stepped surfaces39 of the sweeps 29 The disk 33, behind the Plastic; sweeps-34, isprovided with openings to the rear thereof that conform in configurationto the base'of such sweep. 29:so that. theplastic diskoan be placed overthe *metal disk 26. Thesweeps 29 will penetrate said openthe surfacebeing treated and recovered by the trap or chamber 15 and so arercadilynsubjected to recycling for re-use. This makes; for economybecause such-a particle suction, orrecycling system providesjalight andwell-diffused supply of such particles; to the throw-blades or sweeps29. .Also,,the removable or replaceable plastic plates are forthrow-away or disposablepurposes; This provides an advantageouselementof economy. 'Various sweeps of varying design may be used and. therubber ings so that the stepped plastic surfaces will be brought intoface-to-face relation" with the sweeps 29 and the if if bottom oftheplastic disk- 32- willcome to rest in face-towork shield or shroud 19may be curved or so configured as to substantiallyrencompass irregularor circular pieces to be treated. The device may be so held that the particles can be thrown horizontally, vertically or at any angle to achievethe desired result. Theportability of the device provides for varioususes in Workshops or homes, for finishing masonry, woodwork or metal,including use in foundries, as well as auto body shops and the like. Inplace of abrasive particles, metallic shot may be used for peening orantiquing purposes and the like; and surfaces thatf are old and rusted,such as gas and oil storagetanks, may be cleaned for subsequent paintapplications.

Since certain changes may be made-in the aboveconstruction, anddifierent embodiments of the invention could be made without departingfrom the scope thereof, it is intended that all matter contained in theabove description, or shown the accompanying drawings, shall beinterpreted as illustrative and not in a limiting sense. It is also tobe understood that the following claims are intended to cover all of thegeneric and specific features of the invention herein described, and allstatements of the scope of the invention which, as a matter of language,might be said to fall therebetween.

Having described my invention what I claim as new, and desire to secureby Letters Patent is: v

1. In a device of thecharacter described, for use in treating plane,curved and irregular surfaces by impinging thereagainst and reboundingtherefrom. abrasive particles traveling at high velocity andcontinuously recovering the rebounding particles to recycle the same,comprising a self-contained unit, including a housing having a firstchamber with an outlet for expelling said particles therefrom, a secondchamber connected to said first chamber and having an inlet angularlydisposed adjacent said outlet for recovering said particles therein, anoutletinlet opening in said housing in common communication with theoutlet and inlet of said chambers and angularly disposed thereto throughwhich said particles are ejected from said chamber outlet to be impingedagainst such surfaces and rebounded by deflection into said secondchamber, means providing a return passage for said particles from saidsecond to said first chamber, and a disk disposed within said firstchamber and rotatably mounted therein with a plurality of radiallydisposed particle throwing sweeps mounted on the upper surface of saiddisk, whereby to propel said'particles therefrom and simultaneously tocreate an air flow to move particles from said'second chamber throughsaid passage.

2. In a device as set forth in claim 1, and wherein said sweeps arecurved at their outer endsin the direction of said first chamber outlet.

3. In a device as set forth in claim 1, and further characterized inthat said sweeps are radially grooved on their forward faces. i

4. In a device according to claim 3, in which said grooves arerearwardly stepped.

5. In a device as defined in claim 1, and further characterized in thatsaid housing is provided with an air valve to regulatethe volume of airbeing recycled with said particles.

6. In a device of the character described, for use in treating plane,curved and irregular surfaces by impinging thereagainst and reboundingtherefrom abrasive particles traveling at high velocity and continuouslyrecovering the rebounding particles to recycle the same, comprising aself-contained unit, including a housing having a first chamber with anoutlet for expelling said particles therefrom, a second chamberconnected to said first chamber and having an inlet angularly disposedadjacent said outlet for recovering said particles therein, anoutlet-inlet opening in said housing in common communication with theoutlet and inlet of said chambers and angularly disposed thereto throughwhich said particles are ejected from said chamber outlet to be impingedagainst such surfaces and rebounded by deflection into said secondchamber, .means providing a return passage for said particles from saidsecond to said first chamber, a r0- tary disk within said first chamberto eject said particles therefrom and simultaneously to recyclerebounded particles thereto from said second chamber through saidpassage, a plurality of radially disposed sweeps mounted on ing inconfiguration, to said first sweeps, openings in said plastic disktoreceive said first named sweeps, whereby said plastic disks and sweepsare fitted into faceto-face relation to provide protective surfaces forsaid first disk and first named sweeps against said abrasive particles.

7. in a device of the character described,'for use in treating plane,curved and irregular surfacesby impinging thereagainst and reboundingtherefrom abrasive particles traveling at high velocity and continuouslyrecovering the rebounding particles to recycle the same, comprising aself-contained unit, including a housing hav ing a first chamber with anoutlet for expelling said particles therefrom, a second chamberconnected to said first chamber and having an inlet angularly disposedadjacent said outlet for recovering said particles therein; anoutlet-inlet opening in said housing in common communication with theoutlet and inlet of said chambers and angularly disposed thereto throughwhich said particles are ejected from said chamber outlet to be impingedagainst such surfaces and rebounded by deflection into said secondchamber, means providing a return passage for said particles from saidsecond to said first chamber, rotary means within saidrfirst chamber toeject said particles therefrom and simultaneously to recycle reboundedparticles thereto from said second chamber through said passage, aplurality of bafiles in said second chamber extending transversely ofits walls to collect'and maintain: the rebounded particles in the bottomthereof, a bafiie of said plurality comprising a transverse partitionextending between side walls of said second chamber but spaced from thebottom thereof to provide an inner and an outer passage for directingrebounding particles variously deflected to said bottom when saidoutlet-inlet ope ing is held at a substantially angular position fromthe horizontal and a hinged baffie on the inner side of said partitionintermediate its ends whereby to close off said inner passage when saidoutlet-inlet opening is tilted to a substantially horizontal position.

8. In a device of the character described, for use in treating plane,curved and irregular surfaces by impinging thereagainst and reboundingtherefrom abrasive particles traveling at high velocity and continuouslyrecovering the rebounding particles to recycle the same, comprising aself-contained unit, including a housing having a first chamber. with anoutlet for expelling said particles therefrom, a second chamberconnected to said first chamber and having an inlet angularly disposedadjacent said outlet for recovering said particles therein, anoutlet-inlet opening in said housing in common communication with theoutlet and inlet of said chambers and angularly disposed thereto throughwhich said particles are ejected from said chamber outlet to be impingedagainst such surfaces and rebounded by deflection into said secondchamber, conduit means providing a return passage for said particlesfrom said second to said first chamber, a disk, a plurality of radiallydisposed sweeps mounted on said disk, means for rotating said disk topropel said particles therefrom and simultaneously to create an airflowto remove particles from said second chamber toward said passage, saiddislcbeing wholly disposed Within said housing, and a removableprotective cover formed to receivesaid sweeps and to protect the same inoperation against abrasive particles.

References Cited in the file of this patent UNITED STATES PATENTS2,341,559 Keefer Feb. 15, 1944 2,455,514 Mead Dec. 7, 1948 2,487,366Penno Nov. 8, 1949 2,723,498 Hastrup Nov. 15, 1955 2,770,924 1956 Meadet a1. Nov. 20,

